Number of times one should trill in this passage

[theholygideons]

I have attached the bar featuring the trill which I'm unsure about. Approximately how many times do I trill? Also, as the piece is played at around more or loss 50 crotchet beats per minute, it seems that, If I were to play at tempo, the duration of the trill would be too short to allow me to execute much of a trill.

[adodd81802]

.

[theholygideons]

probably once?

As a trill is defined by the following: Trill (or shake, as it was known from the 16th until the 19th century) is a musical ornament consisting of a rapid alternation between two adjacent notes, usually a semitone or tone apart.... and so in my opinion, one rapid alternation can be considered a trill.

I think you often see the /\/\/\/\/\ line after the tr if you're expected to trill for any real amount of time.

Have you heard any other performances to give you an idea?

They took liberties by slowing down at that trill and trilling multiple times, after which they continue the rest of the phrase at tempo.

Also, what's the correct rhythm for the C# appogiatura before the trill?